2. Order Chiroptera: Cosmopolitan, but especially abundant in the tropics; bones of the arm, and hand are elongate and slender; flight membranes extend from the body, between the digits of forelimb, to the hind limbs; most are insectivorous, but some are fruit eaters. fish eaters, and blood feeders: second largest mammalian order. Examples: Bats

4. Order Edentata or Xenarthra: Incisors and canines absent; cheek teeth, when present, lack enamel; braincase is long and cylindrical; hind foot is four toed; forefoot has two or three prominent toes with large claws; limbs are specialized for climbing or digging; xenarthrous lumbar vertebrae. Examples: Anteaters, tree sloths. armadillos.

5. Order Lagomorpha: Two pairs of upper incisors; one pair of lower incisors: incisors are ever-growing and slowly worn down by feeding on vegetation. Rabbits. pikas.

8. Order Carnivora: Predatory mammals; usually have a highly developed sense of smell and a lame braincase: premolars and molars modified into camassial apparatus; three pairs of upper and inner incisors usually present and canines are well developed. Examples: Dogs, cats, bears, raccoons, minks, sea urns, seals. walruses. otters.

9. Order Prohoscidea: Long, muscular proboscis (trunk) with one or two ringer- like processes at the tip; short skull with the second mc sot on each side of the upper jaw modified into tusks; six cheek teeth are present in each half of each jaw; teeth erupt (grow into place) in sequence from Front to rear, so that one tooth in each jaw is functional. Examples: African and Indian elephants.